Fire class description

SS 424 14 75	IEC	CENELEC	Node
F1			No demands. Cable spreads fire.
F2	IEC 60332-1	EN 60332-1-2	Cable is flame retardant. A vertical 600 mm long cable will be burned with 1 kW propane gas burner. Burning time is from 1 minute to 8 minutes, debending cable diameter.
F3			Cable is flame retardant. Old swedish testing method, where the cable is installed to a vertical tube. Liquid fuel will be burned below this tube. Testing method is no longer valid.
F4			Cables are installed to the vertical bunch in 3,5 m long ladder. The bunch will be burned from the bottom with 20 kW propane gas burner. The fire is not allowed to proceed over 2,5 m high and the cable bunch must be self-extinquishing. F4-class cables are used in places where fire spreading must be stopped. Mostly halogen freedom is supplementary demanding.
F4A F/R	IEC 60332-3-21	EN 60332-3-21	7 liter/m burning material, flame application time 40 minutes. (Over 35mm² installation front and rear of the ladder)
F4A	IEC 60332-3-22	EN 60332-3-22	7 liter/m burning material, flame application time 40 minutes. (Under 35mm² installation front of the ladder)
F4B	IEC 60332-3-23	EN 60332-3-23	3,5 liter/m burning material, flame application time 40 minutes.
F4C	IEC 60332-3-24	EN 60332-3-24	1,5 liter/m burning material, flame application time 20 minutes.
F4D	IEC 60332-3-25	EN 60332-3-25	0,5 liter/m burning material, flame application time 20 minutes.

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